car shakes/studders when under load-1997 expedition 5.4L

Asked by Jan 25, 2016 at 11:21 AM about the 1997 Ford Expedition 4 Dr XLT 4WD SUV

Question type: Maintenance & Repair

up to 45 mph seems okay. after that it feels like it's missing badly. have trouble when going up a hill...Tranny or engine? no warning lights.  feels like a bad coil or 2 or 3 bad ones.. Tranny fluid okay and clean. has 200,000 miles but has never had a problem...no sign of tranny fluid change or filter replacement in last 10 years...Anybody got any ideas?    PLEASE

4 Answers

75,595

Could be a miss in the engine which would be my first guess. Probably needs a tune up and going over. The trany, just have the filter and fluid changed. Do not get a trany flush, or it will be junk for sure withing 6 months.

83,325

That sounds like an ignition miss. On my Triton 5.4 I have to drive quite a few miles with a bad coil before I get a code reading telling me what coil is bad. I would replace all the plugs when you replace any coils.

Best Answer Mark helpful

Thanks for the info...I replaced a bad coil about a month before all of this started. I had the same problem then, but not nearly as bad. When that coil was replaced, the plugs were not changed. Do you know what the box behind the passenger kick panel is .I have also been having water leakage behind the headliner in the far right top corner on the passenger and it leaks on the box I mentioned. I have sealed all rubber on doors and windshield. Still leaks. I was told to try sealing the roof rack at the torx bolts. Thought water dripping on the box and then down to the carpet could be causing electrical problems... I have always done most of my own work on my cars, But things have really changed. My '56 chevy was easy to work on and it ONLY had ONE COIL.... Thanks for any more info you have, I appreciate it.

83,325

The box you mention is the fuse box.

Your Answer

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